Investors Are Curious if Berkshire CEO Is Still Looking for Big Deals After Heinz

Two years ago, Warren Buffett told Berkshire Hathaway Inc. shareholders he was on the lookout for major acquisitions, as part of his unending effort to profitably employ the buckets of cash his company collects every month.

Since then, however, the billionaire investor has fired what he called his "elephant gun" just twice. Berkshire in February said it would join with a Brazilian investment firm to buy ketchup maker H.J....